问题
选择题
Bears ________ fat stores throughout the summer and fall to have energy enough to last them through their winter sleep.
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答案
B
解析 考查动词短语辨析。pack up打包，收拾行李；build up搭建，积累，增强；bring up养育，抚养；take up占据，拿起。根据句意“熊在夏秋两季积累自己的脂肪储备，以便在冬眠时有充足的能量来度过冬季。”知B项符合题意。
